The prepayment interest of China Merchants Bank's credit card by installment is related to the installment method. Generally, credit card installment has no interest, but there is a handling fee. The handling fee has different rates according to the number of installments, and the handling fee for each installment = total installment amount × handling fee rate for each installment. In case of prepayment, the cardholder shall pay off the outstanding installment amount and handling fee in one lump sum. The cardholder applies for "e-loan" to repay at any time, and does not enjoy the interest-free repayment period, and the interest is charged on a daily basis.